cam_pos      = [-0.0229331, 1.26029, 1.24984]';
cam_dir      = [0.540145, -0.12249, -0.83261]';
cam_up       = [-0.466775, 0.77962, -0.417509]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.931346, -0.816829, -0.484031]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;